release/src-rt-6.x.4708/linux/linux-2.6.36/fs/partitions/ibm.c

   1 /*
   2  * File...........: linux/fs/partitions/ibm.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Volker Sameske <sameske@de.ibm.com>
   5  * Bugreports.to..: <Linux390@de.ibm.com>
   6  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   7  */
   8
   9 #include <linux/buffer_head.h>
  10 #include <linux/hdreg.h>
  11 #include <linux/slab.h>
  12 #include <asm/dasd.h>
  13 #include <asm/ebcdic.h>
  14 #include <asm/uaccess.h>
  15 #include <asm/vtoc.h>
  16
  17 #include "check.h"
  18 #include "ibm.h"
  19
  20 /*
  21  * compute the block number from a
  22  * cyl-cyl-head-head structure
  23  */
  24 static sector_t
  25 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
  26
  27         sector_t cyl;
  28         __u16 head;
  29
  30         /*decode cylinder and heads for large volumes */
  31         cyl = ptr->hh & 0xFFF0;
  32         cyl <<= 12;
  33         cyl |= ptr->cc;
  34         head = ptr->hh & 0x000F;
  35         return cyl * geo->heads * geo->sectors +
  36                head * geo->sectors;
  37 }
  38
  39 /*
  40  * compute the block number from a
  41  * cyl-cyl-head-head-block structure
  42  */
  43 static sector_t
  44 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
  45
  46         sector_t cyl;
  47         __u16 head;
  48
  49         /*decode cylinder and heads for large volumes */
  50         cyl = ptr->hh & 0xFFF0;
  51         cyl <<= 12;
  52         cyl |= ptr->cc;
  53         head = ptr->hh & 0x000F;
  54         return  cyl * geo->heads * geo->sectors +
  55                 head * geo->sectors +
  56                 ptr->b;
  57 }
  58
  59 /*
  60  */
  61 int ibm_partition(struct parsed_partitions *state)
  62 {
  63         struct block_device *bdev = state->bdev;
  64         int blocksize, res;
  65         loff_t i_size, offset, size, fmt_size;
  66         dasd_information2_t *info;
  67         struct hd_geometry *geo;
  68         char type[5] = {0,};
  69         char name[7] = {0,};
  70         union label_t {
  71                 struct vtoc_volume_label_cdl vol;
  72                 struct vtoc_volume_label_ldl lnx;
  73                 struct vtoc_cms_label cms;
  74         } *label;
  75         unsigned char *data;
  76         Sector sect;
  77         sector_t labelsect;
  78         char tmp[64];
  79
  80         res = 0;
  81         blocksize = bdev_logical_block_size(bdev);
  82         if (blocksize <= 0)
  83                 goto out_exit;
  84         i_size = i_size_read(bdev->bd_inode);
  85         if (i_size == 0)
  86                 goto out_exit;
  87
  88         info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
  89         if (info == NULL)
  90                 goto out_exit;
  91         geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
  92         if (geo == NULL)
  93                 goto out_nogeo;
  94         label = kmalloc(sizeof(union label_t), GFP_KERNEL);
  95         if (label == NULL)
  96                 goto out_nolab;
  97
  98         if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
  99             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
 100                 goto out_freeall;
 101
 102         /*
 103          * Special case for FBA disks: label sector does not depend on
 104          * blocksize.
 105          */
 106         if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
 107             (info->cu_type == 0x3880 && info->dev_type == 0x3370))
 108                 labelsect = info->label_block;
 109         else
 110                 labelsect = info->label_block * (blocksize >> 9);
 111
 112         /*
 113          * Get volume label, extract name and type.
 114          */
 115         data = read_part_sector(state, labelsect, &sect);
 116         if (data == NULL)
 117                 goto out_readerr;
 118
 119         memcpy(label, data, sizeof(union label_t));
 120         put_dev_sector(sect);
 121
 122         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
 123                 strncpy(type, label->vol.vollbl, 4);
 124                 strncpy(name, label->vol.volid, 6);
 125         } else {
 126                 strncpy(type, label->lnx.vollbl, 4);
 127                 strncpy(name, label->lnx.volid, 6);
 128         }
 129         EBCASC(type, 4);
 130         EBCASC(name, 6);
 131
 132         res = 1;
 133
 134         /*
 135          * Three different formats: LDL, CDL and unformated disk
 136          *
 137          * identified by info->format
 138          *
 139          * unformated disks we do not have to care about
 140          */
 141         if (info->format == DASD_FORMAT_LDL) {
 142                 if (strncmp(type, "CMS1", 4) == 0) {
 143                         /*
 144                          * VM style CMS1 labeled disk
 145                          */
 146                         blocksize = label->cms.block_size;
 147                         if (label->cms.disk_offset != 0) {
 148                                 snprintf(tmp, sizeof(tmp), "CMS1/%8s(MDSK):", name);
 149                                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
 150                                 /* disk is reserved minidisk */
 151                                 offset = label->cms.disk_offset;
 152                                 size = (label->cms.block_count - 1)
 153                                         * (blocksize >> 9);
 154                         } else {
 155                                 snprintf(tmp, sizeof(tmp), "CMS1/%8s:", name);
 156                                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
 157                                 offset = (info->label_block + 1);
 158                                 size = label->cms.block_count
 159                                         * (blocksize >> 9);
 160                         }
 161                         put_partition(state, 1, offset*(blocksize >> 9),
 162                                       size-offset*(blocksize >> 9));
 163                 } else {
 164                         if (strncmp(type, "LNX1", 4) == 0) {
 165                                 snprintf(tmp, sizeof(tmp), "LNX1/%8s:", name);
 166                                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
 167                                 if (label->lnx.ldl_version == 0xf2) {
 168                                         fmt_size = label->lnx.formatted_blocks
 169                                                 * (blocksize >> 9);
 170                                 } else if (!strcmp(info->type, "ECKD")) {
 171                                         /* formated w/o large volume support */
 172                                         fmt_size = geo->cylinders * geo->heads
 173                                               * geo->sectors * (blocksize >> 9);
 174                                 } else {
 175                                         /* old label and no usable disk geometry
 176                                          * (e.g. DIAG) */
 177                                         fmt_size = i_size >> 9;
 178                                 }
 179                                 size = i_size >> 9;
 180                                 if (fmt_size < size)
 181                                         size = fmt_size;
 182                                 offset = (info->label_block + 1);
 183                         } else {
 184                                 /* unlabeled disk */
 185                                 strlcat(state->pp_buf, "(nonl)", PAGE_SIZE);
 186                                 size = i_size >> 9;
 187                                 offset = (info->label_block + 1);
 188                         }
 189                         put_partition(state, 1, offset*(blocksize >> 9),
 190                                       size-offset*(blocksize >> 9));
 191                 }
 192         } else if (info->format == DASD_FORMAT_CDL) {
 193                 /*
 194                  * New style CDL formatted disk
 195                  */
 196                 sector_t blk;
 197                 int counter;
 198
 199                 /*
 200                  * check if VOL1 label is available
 201                  * if not, something is wrong, skipping partition detection
 202                  */
 203                 if (strncmp(type, "VOL1",  4) == 0) {
 204                         snprintf(tmp, sizeof(tmp), "VOL1/%8s:", name);
 205                         strlcat(state->pp_buf, tmp, PAGE_SIZE);
 206                         /*
 207                          * get block number and read then go through format1
 208                          * labels
 209                          */
 210                         blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
 211                         counter = 0;
 212                         data = read_part_sector(state, blk * (blocksize/512),
 213                                                 &sect);
 214                         while (data != NULL) {
 215                                 struct vtoc_format1_label f1;
 216
 217                                 memcpy(&f1, data,
 218                                        sizeof(struct vtoc_format1_label));
 219                                 put_dev_sector(sect);
 220
 221                                 /* skip FMT4 / FMT5 / FMT7 labels */
 222                                 if (f1.DS1FMTID == _ascebc['4']
 223                                     || f1.DS1FMTID == _ascebc['5']
 224                                     || f1.DS1FMTID == _ascebc['7']
 225                                     || f1.DS1FMTID == _ascebc['9']) {
 226                                         blk++;
 227                                         data = read_part_sector(state,
 228                                                 blk * (blocksize/512), &sect);
 229                                         continue;
 230                                 }
 231
 232                                 /* only FMT1 and 8 labels valid at this point */
 233                                 if (f1.DS1FMTID != _ascebc['1'] &&
 234                                     f1.DS1FMTID != _ascebc['8'])
 235                                         break;
 236
 237                                 /* OK, we got valid partition data */
 238                                 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
 239                                 size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
 240                                         offset + geo->sectors;
 241                                 if (counter >= state->limit)
 242                                         break;
 243                                 put_partition(state, counter + 1,
 244                                               offset * (blocksize >> 9),
 245                                               size * (blocksize >> 9));
 246                                 counter++;
 247                                 blk++;
 248                                 data = read_part_sector(state,
 249                                                 blk * (blocksize/512), &sect);
 250                         }
 251
 252                         if (!data)
 253                                 /* Are we not supposed to report this ? */
 254                                 goto out_readerr;
 255                 } else
 256                         printk(KERN_WARNING "Warning, expected Label VOL1 not "
 257                                "found, treating as CDL formated Disk");
 258
 259         }
 260
 261         strlcat(state->pp_buf, "\n", PAGE_SIZE);
 262         goto out_freeall;
 263
 264
 265 out_readerr:
 266         res = -1;
 267 out_freeall:
 268         kfree(label);
 269 out_nolab:
 270         kfree(geo);
 271 out_nogeo:
 272         kfree(info);
 273 out_exit:
 274         return res;
 275 }